Photometric observations made in 2012 at the Organ Mesa Observatory in
Las Cruces, New Mexico produced a
light curve with a period of 21.040 ± 0.001 hours. There are two brightness minima, having luminosity variations of 0.05 and 0.12 in
magnitude, respectively. In 2000, Michalak estimated Hestia to have a mass of 3.5 kg. Even though Hestia is only about 124 km in diameter, This older 1997 estimate would give it a density of 14+ g/cm3 and make Hestia more massive than several much larger asteroids. ==References==